<template>
  <div>

    <swiper ref="mySwiper" :options="swiperOptions">
      <swiper-slide v-for="item in banner" :key="item.title">
        <img :src="item.image" alt="" width="100%">
      </swiper-slide>
      <div class="swiper-pagination" slot="pagination"></div>
    </swiper>
    <!--轮播图片按钮-->
    <ul class="list">
      <li v-for="(item,index) in banner"
          :key="item.title"
          :class="{active:index==num}"
          @click="changeSwiper(index)"
      >
        {{ item.title }}
      </li>
    </ul>
  </div>
</template>

<script>


import api from "@/api";

export default {
  name: "VueSwiper",
  data() {
    let that = this;
    return {
      num: 0,
      arr: [1, 2, 3, 4, 5],
      banner: [],//轮播图
      swiperOptions: {//swiper配置
        pagination: {
          el: '.swiper-pagination'
        },
        autoplay: {
          delay: 3000,
          stopOnLastSlide: false,
          disableOnInteraction: false,
        },
        loop: true,
        on: {
          //回调函数，swiper从一个slide过渡到另一个slide开始时执行
          slideChangeTransitionStart() {
            if (this.activeIndex === that.arr.length+1) {
              that.num = 0;
            } else {
              that.num = this.activeIndex - 1;
            }

          }
        }
      }
    }
  },
  methods: {
    changeSwiper(index) {
      //高亮选中
      this.num = index;
      //让swiper切换
      this.swiper.slideTo(index + 1, 1000, false);
    }
  },
  computed: {//获取swiper实例
    swiper() {
      return this.$refs.mySwiper.$swiper
    }
  },
  mounted() {//进入后进入下标为3的位置
    api.getSwiperBanner().then(res => {
      this.banner = res.data.result;
      console.log('图',res.data.result);
    })

  }
}
</script>

<style scoped>
.list {
  display: flex;
}

.list li {
  flex: 1;
  padding: 0.1rem;
  font-size: 0.24rem;
  line-height: 0.32rem;
  margin: 0.1rem;
  background: #eeeeee;
  color: #666666;
  text-align: center;
  display: flex;
  align-items: center;
}

.list .active {
  background: #4169e2;
  color: #eeeeee;
}
</style>
